Mishkat al-Masabih 30 Fine Qualities كتاب المناقب 79

وَعَنْ حُذَيْفَةَ قَالَ: قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ: ” إِنِّي لَا أَدْرِي مَا بَقَائِي فِيكُمْ؟ فَاقْتَدُوا بِاللَّذَيْنِ مِنْ بَعْدِي: أَبِي بكر وَعمر ” . رَوَاهُ التِّرْمِذِيّ

Hudhaifa reported God’s messenger as saying, “I do not know how long I shall remain among you, so copy those two who will remain after I am gone, Abu Bakr and `Umar.” Tirmidhi transmitted it.